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Soft plasma electrolysis with complex ions for optimizing electrochemical performance.

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Adding ethylenediaminetetraacetic acid (EDTA) and Cu-EDTA to plasma electrolytic oxidation (PEO) electrolytes reduced porosity in aluminum alloy coatings. Cu-EDTA offered superior corrosion resistance by modifying plasma discharges and coating structure.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Engineering

Background:

  • Plasma electrolytic oxidation (PEO) is a surface treatment for light metals.
  • Porous coatings from PEO can limit performance due to excessive plasma discharges.

Purpose of the Study:

  • To improve the electrochemical properties of PEO coatings on Al-1.1Mg alloy.
  • To investigate the effect of ethylenediaminetetraacetic acid (EDTA) and Cu-EDTA as electrolyte additives.

Main Methods:

  • Fabrication of PEO coatings on Al-1.1Mg alloy using alternating current in silicate electrolytes.
  • Inclusion of EDTA and Cu-EDTA as electrolyte additives.
  • Analysis of coating structure, plasma discharge behavior, and electrochemical properties.

Main Results:

  • EDTA additives modified plasma discharges, resulting in lower coating porosity.
  • Cu-EDTA further reduced discharge channels and altered dielectric behavior due to Cu2O/CuO incorporation.
  • PEO coatings with Cu-EDTA exhibited superior corrosion resistance compared to those with EDTA or no additives.

Conclusions:

  • EDTA and Cu-EDTA effectively reduce porosity and enhance electrochemical properties of PEO coatings.
  • Cu-EDTA provides superior corrosion resistance due to modified dielectric properties and reduced discharge channels.
  • The study elucidates the electrochemical mechanism for improved corrosion protection using an equivalent circuit model.